Carberator suggestions::::

[ddbyrd3]

My buddy has a 1992 22' Chapparrel with a 350cid chevy motor, and the Penta Dual prop outdrive. He is replacing the factor quadajet with a Edelbrock 650 AFB carb and a performer manifold.<br /><br />The reason is because the throttle shaft is completly shot and has a major vacuum leak.<br /><br />My question; is the Edelbrock 650 AFB a good carb for this application, or should he consider the 600 CFM AFB?????

 

[ddbyrd3]

Re: Carberator suggestions::::

Anybody?????????

 

[salty87]

Re: Carberator suggestions::::

has he checked with edelbrock? they were fairly helpful when i bought a 750 cfm from them.<br /><br />i'd be inclined to go with the 650 but i am no expert.

 

[Ralph 123]

Re: Carberator suggestions::::

They only make a 600 and 750 in marine carbs. Your friend isn't planning on using an auto carb is he? I use the 600s on my 350s.<br /><br /> http://www.edelbrock.com/automotive/marine.html <br /><br />I'm also not too sure about their intakes. Is he planning on using an Aluminum one? That may be a problem if the engine is raw water cooled especially if you boat in saltwater.

 

[ddbyrd3]

Re: Carberator suggestions::::

Boat is fresh water only, and he will be using a stock manifold..

 

[Ralph 123]

Re: Carberator suggestions::::

Ok I broke open Moore:<br /><br />"A carb that is just big enough to flow all the air the engine wants but no bigger is the secret to carb selection. Small carbs meter fuel more efficiently than large carbs. Fuel economy, throttle response, low speed torque, idle quality and extended spark plug life are the benefits of selecting a carb that is sized correctly for an engine.... the closer that the engine size, max RPM and carb size match, the closer the factory (out of the box) jetting will be to optimum. If a carb too large is selected, out of the box jetting will be too small, so larger jets are required."<br /><br />Then, in the table, the 350 is shown reaching 5900 rmp with a 600cfm carb while a 650cfm is shown making 6400rpm, 700cfm making 6900rmp and a 750cfm making 7400rpm<br /><br />Since most marine engines recommend a max rpm in the 5,000 rmp area, the 600cfm is best.

 

[Ralph 123]

Re: Carberator suggestions::::

Moore says, even if you boat in fresh avoid Al if you can in favor of cast due to expansion contractions rates, the faster heat transfer of AL causing the air/fuel hitting a hot intake causing an effectively lower compression ratio and they quickly corrode around thermo housing and "A new Aluminum intake manifold may need to be replaced as often as every two or three seasons of boating."

 

[ddbyrd3]

Re: Carberator suggestions::::

Awesome info guys.... Thanks.......

 

[Scaaty]

Re: Carberator suggestions::::

Originally posted by Ralph:<br /> They only make a 600 and 750 in marine carbs. Your friend isn't planning on using an auto carb is he? I use the 600s on my 350s.<br />

YEP, I have the 600 on my 350, and tossed the Q overboard (ebay anyway). Haven't touched it since. And Ralph has a VERY GOOD POINT. As Edelbrock, DOES NOT MAKE A 650 MARINE CARB, you had better inform your buddy marine carb ONLY

 

[ddbyrd3]

Re: Carberator suggestions::::

Cool, he just ordered the 600cfm MARINE carb today..<br /><br />Thanks again for the imput!!!!